libata: cleanup ata_sff_interrupt()

host->ports[i] is never NULL if i < host->n_ports and non-NULL return
from ata_qc_from_tag() guarantees that the returned qc is active.
Drop unnecessary tests.

Superflous () dropped as suggested by Sergei.
Signed-off-by: NTejun Heo <tj@kernel.org>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>

drivers/ata/libata-sff.c

@@ -1770,18 +1770,15 @@ irqreturn_t ata_sff_interrupt(int irq, void *dev_instance)
 	spin_lock_irqsave(&host->lock, flags);
 
 	for (i = 0; i < host->n_ports; i++) {
-		struct ata_port *ap;
+		struct ata_port *ap = host->ports[i];
+		struct ata_queued_cmd *qc;
 
-		ap = host->ports[i];
-		if (ap &&
-		    !(ap->flags & ATA_FLAG_DISABLED)) {
-			struct ata_queued_cmd *qc;
+		if (unlikely(ap->flags & ATA_FLAG_DISABLED))
+			continue;
 
-			qc = ata_qc_from_tag(ap, ap->link.active_tag);
-			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
-			    (qc->flags & ATA_QCFLAG_ACTIVE))
-				handled |= ata_sff_host_intr(ap, qc);
-		}
+		qc = ata_qc_from_tag(ap, ap->link.active_tag);
+		if (qc && !(qc->tf.flags & ATA_TFLAG_POLLING))
+			handled |= ata_sff_host_intr(ap, qc);
 	}
 
 	spin_unlock_irqrestore(&host->lock, flags);